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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07a8e3dc24fb34bc93cabbc1c76f0af64d9f5aff2a47ed125295efa14427bc31' 
  AND token = 'fn7UceivPllJnDQprhGKh7IE/E808ikRqEyGDDVN17Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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