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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbafb15fe9b568442335fa082f80b4dcdf5cd9ad9066f9df98b9f27b0aae5651' 
  AND token = 'yzQAwpBTOWPx6AoaumGkUdW5OoC0g25JIQggKUwbjm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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