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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c8b9133d53fca484b05afacc8d47726a71661459a0974cbf972605be8fc014' 
  AND token = '4IhkefJWQz964s+21B5I+C9Cw8GMVRqRIGFMMTM6X8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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