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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a067850611c3513594f961cafbbe0ea9fc64bcead7de9a82f80691e0694ed695' 
  AND token = 'GQDRd6Ab7lmpQS8xSCLezv4gy0q3iSZ8pRLgv5Z3UaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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