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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04342348b2ad922ed7d5beff47d046ac6f36b4ef36742b496d637c3eb6436704' 
  AND token = 'kJIZpkzMpJMSXVIpir46jFPYl8nIk19iBXUXtpoAW1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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