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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca4079a9ba0320a9e080625dcd7a91b92c8701a6063886e1adcc9e32e64c96' 
  AND token = 'LVof5IDIhVEyPkuitIy0MW5nBN8eW1tXECUDCM+BwAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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