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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '054e35f795be8b97821cc6bdeacc6250cf8a97d57c24ed1020c74ea856ac32ff' 
  AND token = 'Y/vynHdhW+77oSDXs3koL0z60Mk6J63gsAzsaKTOxqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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