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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a71e1f9e052d05b16a1898fbfd6e33d8167bcddf8cc652eba67b5fe82a9a143' 
  AND token = '87gAM3a0vAHLAX1XqtdzsWzStg8BrvtxsnrOol1jFbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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