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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7ea91bb1bd83862bedc26bf05944368e7c6a71cd5e5a71cbcf48b87a2f5f14' 
  AND token = 'kinxm2alsi3JelAh3k8URcxtXhdfsGIkH2G3QuyKI2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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