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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3415562217e8bbaa37ac984be8b8c680dab1a222b84fed9c5b8625b533b67fa' 
  AND token = 'vGXUEpcUs4g+HOMce5biTKkE3unCC13aJKJrZfymEcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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