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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '172917cde95d043c3dc5c545a26c2538fbe50f1f2724cef093c83f779d96c23f' 
  AND token = 'QMDxjWiYmdEf11iyA5IXAPWXwI3/BP6ccIp9nQVWGOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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