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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a28391fd8d7ed9aa4bf36fe8c20104b0cbad71283590fad548f7592a5d72cae' 
  AND token = 'w7Z1i+3HiFVRJzlcvGa7cga695QCa3ZDZV1sv/5Jc2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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