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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07c795574f013e49f150de150a3f5f6cce7d7fab6d6a682e96d726d54be6ceb' 
  AND token = 'dz9C5YXqQ3MW0KKz9u6xVT3lNPdcW4UYdveCrV5Qi1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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