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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e9199d0b9fd9f868684a5fa5a2fb89d4f67dc7237eaa81ac2c4f7bcc3f2351' 
  AND token = 'gOu7YP5X5WfayYWFfyzOG4hE5x/mnbDIjIPzvoXKAPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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