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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b276b02c634878b61141ad79daa134c154ee8bb91720853d9395f982607cd16' 
  AND token = '9OW5YunYAY04Mc1ew8gKTndqRPI+oqYEbhAz3AWjmUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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