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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e6a1edbc6a829962f91a1247d5a96f6dc4785f7a4636523df047ce5d3c951e' 
  AND token = 'tykte3jHU+MLn5Vd3NecBsZeCMeNDlNVr4bXvrGx+18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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