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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a5f97bc2e8923b8d3378654f68264ac8a49618cf8ebfd61a0eb0ef7851e9f8f' 
  AND token = 'SKAi+eQJ8nXfIJnExRPmZIl4pv6G6EOEgQHf8CgxcN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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