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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c5c1a94db4268a7bd2d678a9aa33b283991ccea5210ea599a08ebeae4b0dc3' 
  AND token = 'm+5SKoc3c3L09uAfhmhPnxn4UlgQRdnVKZb640ZD76A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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