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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e468561b75243856625978b77b008b638a76b31fe975fbc626078e55f0b9b90' 
  AND token = 'uoxGJfQdLHOUr4CDAeaVqhbncWZJGVf7fHViJxvUzVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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