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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42789cf8056aff190457e16741649b10c5ec77c6cc9d293856b341417ee0543' 
  AND token = '79U4SBk3yhHZpD4EeNKGtpETAlhEfSgSQ6gOUsvjY0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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