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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd3fcc1613b9cf60d8fb84f144438e981d4234942c06444319a72aa8bdf8b4b4' 
  AND token = 'Ns8TwEtq1UNGYHR18heoNTvoixuNnjodZxLXV0dHUlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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