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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79934659762d9e7f1f35209965c8e60720e25f407b065530a1d7b0937b84c3ea' 
  AND token = 'NUjyDo4Vcu4FJl38+tZxjfCwos1LcUTQmtQ0Ck7yt5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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