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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5d4d3908081d6a611ff97a1cac396b3f40bb23808b4b3393f5bed4738a1eb9' 
  AND token = '5xy8dxsVEtgR+PN8V2oYjunthHolgW1eSYHjKBNDj2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}