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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712438cd3b7a164bd9109ed3fe92017108e8647b56be6e26dde9f95fede1bd4a' 
  AND token = 'gH94YWgvc2IXruoIj8g4WnGDSC+ElGq4az1FV9QJPaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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