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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6ecdfd4e15098c26dabb1913038429f4300c863c98c571888c580781cb03ae' 
  AND token = '8/GWEHW6BZ4e6g5W6Hu7o7f/IGPsQAQoZhzEsHgQYJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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