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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a6526f05a43d18e767acc53abbd0a2dd1eeb7b2f5912357dd02ee4f4568228' 
  AND token = 'iOjrO7avJERbBjUBA33mbfi7fHmLv4pFdu2rRkBi6c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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