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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f8164bdac304c14907916a479785629c6ae823915ea9145a8c41c38c65e1e2b' 
  AND token = 'dXGxoYkHmIcQdJXYkdMq1hkO9dVp7o3bc4MZDMFWJt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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