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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89d1e4c9332dc8d4faba9f0d36bccd848dba61e90724de6e4b60c79fedae2c09' 
  AND token = '7rl72vWP9XtQ7GtEVC5oWdNSj8IYdc7W//5lIZqJBrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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