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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf9f74f17e679d2007ada7c45862390ef0e6fdcb5c0e6f6cc2b04eb20f20b9f' 
  AND token = 'lG1uV0dtcZDDi3NWXyf5sRowfhthk3yn9MpFgUryn4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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