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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6b1ea7d6633a5556bf3fd6dfda36b2127b43d1d5fb53286264f5bd0d76b0f9d' 
  AND token = 'tuw8osDzS+RoFGEHnDTijRMrKIDS2dFp3q4N98V90V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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