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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '662bd904f8562f8bcb78bb216acdb2214c24e0bf74a2890cbf063f333b7a82f5' 
  AND token = 'fud5kcHdPPuAupS+DuXwezfHuR3QFGW/I37rxkyPI54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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