SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d583c5b703969c4664ed3a0f58b9bd04a7c8a17c6c3989342904ee673ed124b' 
  AND token = 'HRRKXnPT4qgs+02RYtGZjBdjhEww6uc2VQx1m+QsnF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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