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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30002f4a314d9028913a04c8c81c329bad7b71254da9b8adaf6eca076725ccae' 
  AND token = 'ZcYW+J+cT/cGAAddymC1HYZN8VALj2OrDwnJi0iKUac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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