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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63453e492168dbf80fa0cc1b9897a6f0ce77731e2bc9e0ecbbd8aa3713a03a79' 
  AND token = 'ntG2omIrEGCoByOYCxJdVf8l+p+I6cBN40JfDaVkTlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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