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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c773d9d9eb25ddca7494ac7156cf14f0760fe4b6e57569bc650c70d2a66fe247' 
  AND token = 'Jiq/6QncbzAT4IbypuQdRluWhArH9o0OlC2/txhVRzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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