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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5972f760469d9b8fa3f7c83a621c650cc1caf979a65ad7e950a8f9df9b6e694a' 
  AND token = '5tZBwEFznHcQZKioXGev+0Cqmb65FSfq6EDxIJhuqs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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