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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f92aa86a7bf17e2b952d7f68f94f9a03c5259eb425b1fe657a8c4fe72583da' 
  AND token = 'rySNjM3EtIl7JsQabynh1GYnXu0ADWXfE/2Z5fugDgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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