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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a24a56fb9a87d2eb12786ef6d72aafe95649b8c213ed1094eb3c612873d85549' 
  AND token = 'KFyIgAECQj0NhCD6pkyvjY72UUyNoNtK4vZQxLTwkfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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