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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ea42c3002ae137ee04a8a424c99b9ccc0ba4304f04bd837ddae5602162a9c4' 
  AND token = 'HHhinWFAGvxFj9KXt45Khf5X8wRjFBZhpbRquwKjYCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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