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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f85ad98df040ebd0b25cfb3478e8451b346806007dfea666cd10f728fe348bf' 
  AND token = 'uYoBpOSkmc9W+q9sLefc0/biZzz67AF+9W5iEnGXHpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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