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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e36dd0e8d14e62f93f7cda1c659b2c5788b4f9c15da85920fde6969c4b567b9' 
  AND token = 'VQed0kzfTUufNBlFoXwL9r50mUOJD/2nW0F2U5YoDhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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