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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2872d635f07530af1aea489f07d95e33ebcbdceb4e18a8459defa0f1937038bf' 
  AND token = 'l6WXBKixMj6B0iYhjqu18H9GD9y6zu7PMiXVLM5w2OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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