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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac859573e2143ef70a0a7d57314a8fc11ec5f40b43d9ab4eb284916575164fda' 
  AND token = 'eK7y96YFa00cFDMbEP7OuVxgX//PX6+JQE4UhFlO1mY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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