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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5039cca2bd06eeda195fa212683f086f3ba27e0e7e256ce4b70ccf69f6bee235' 
  AND token = 'yxVlzxHGHwl9wKFbwrTWykM+eL06i/T/xkoVUaMd9js=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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