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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4774f0d347377fec9ee7f57a8b471a0258b5c8dd998e6675be2152ecc0ef09b7' 
  AND token = '2+mZ9WD1NGknhbN75RtD8AsBFyYSQNSei0ApUTm2AAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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