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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8bd3bf48aa4aac184ad13e5b3b682093e937b94fe6b4551a8b5af8b4e2c1f60' 
  AND token = 'oFW93iGrzHyXGaMFT9lYF35QB1alLHwkmlZ8U7CnD3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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