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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c48e4b1b835d07785ca139ed2b23fc2516d56415f74ad9e5c2e3f8d31113fb2' 
  AND token = 'RMBmY1wDdXndxRlMnIOJBDAqu7fFxL3fS7pxdJ77+yY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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