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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8a2e4ccc9afdbc771f7ca7cd34244c8e76680cb5b19ca993433d9d55d3e3ad' 
  AND token = 'Sh3HhlCLhbmlVeh2q/CiPcI3lMZQydE+3BBBi73LyI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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