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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020733c1e674662b0bd34cc6db58562e4856df95557961dc3e5892edfd4add32' 
  AND token = '3KcYqTUa0gdWprmG0gA5lYQEoqWqHl38XPhYzfMaIbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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