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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6670d9b729c626f37042284bcb888af07bd8f83c5c0321463ee56e2e7d6573bc' 
  AND token = 'L08MjyGs5Hn1iDekd+jcHO7KGjeY6HV/dAVjdzpTsZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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