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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbe3fb6b6dad24dbaa673dc92c726405a204ae5552b2c0c0a3d07052be56d54e' 
  AND token = 'h7brlss0p7WMFO8ZonJUvBIrymoIvkZn/xtNWuwQijM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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