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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e98623e8e1d929aa53786e39833f70792fbfc6824a89e89658e8a9abf4e6ef6' 
  AND token = 'wdSlnOlw7OGWmPlM3n33xVXMNsO5J6oDTjEKAId+bVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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