SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e5b532774c91092b689806951856979ffcfdd0af10c6e8cefcbcc277954161' 
  AND token = 'uPPzYVqVAw24Bl/iafg4YSqiUBlX/eWfFhIk7mX3ztE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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