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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e12fa60a61d435a49f9a605b0334388c2122a8a864d57a68c3e15fb9f64a19b' 
  AND token = 'mnHTMNJYVHThKNiDHblBMzR134oXII50IMnr9ONSqRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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