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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dff2b9edd83b9095535949f9b48d70290f6d865307c274f42a4461597138f1a' 
  AND token = 'ysomuBrhcHhHpuT+r80b3qVn0OE6MyOn97Kcv5vWicI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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