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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa0a820b6a1c80521ad8a7f504deece8f00d6286b76ead6d6a69c97b7a2f1c64' 
  AND token = 'TQmi/+uevDttf6YzKcyQB8V05Rr4FzLSd3ohX+U5n7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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