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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdc2b855eb1c6de908dcfe078e1b248b9306aadbdfbb3d6c2c9805232cf9aa90' 
  AND token = 'Vf3kzZ7OpRJWAbfS1hKzlGmwnijUIwJfpV2t61xaXTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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