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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d62fd2432e4b5f909f9e6dfb9f30904738692e9c67c7e97d779a53618a688b9' 
  AND token = '3QzyStps63kxkRMXXQCvtMYW25K4g+2vRXXh1b2mnWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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