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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08ed7b77ae6ca3e0fddbe17b6949141147c17481e5ad7c759deed2d0e4ad118' 
  AND token = 'nj3ESfgxVjSzd9qg95A1/Abs4+7SNbGBcSLeK2c7f8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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