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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90328d2c6ce95e2b2b8f33abae0e10108f6f3e7c79e05ec90d391f715027126b' 
  AND token = 'st995UTsR0R6Wc8Z8p3hrQe1VGZG0YRhkm6xiE9ppgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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