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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5912d58a875f04a107cab51723e15b3b5de4134ae18845e6811c0e715dd307e8' 
  AND token = 'ZYhzaqrHjfMrcde5N6u9N/uuWh/9NEYPBv36Pu0CYA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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