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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd766333b47cfbe27f1ad96420aba5b41c21dcbe3632457345ec22045d6b40b68' 
  AND token = 'zIaFXiuJ1t5EMjs9lgpX2ZeJXUvzehBgNB0V0KLOAUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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