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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab855323f6b57573f202691c162263d564cd33e28cba8b2dea37909e681eb13c' 
  AND token = '5dpvZKNxsuMsPRRR+sAtxW8RANUeWzXo3Z70sO88CaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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