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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd22d30f21b41d724eea01380c6285f12cf6b47b23a1b1a74fdc37cca7c6fc080' 
  AND token = '4+qLPuQephWkVJIqoQsp3O8trxNddkxnBwySqRGXXbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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