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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aabd2ca4a07f61d5e5f969dd2b8f7a10943738a5aba512c71056ad9be569b603' 
  AND token = 'F0X0LcvIqpXSF7/UmDDfBHdAIJusLGBUGx6xa2skglU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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