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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89688ca010d5f930b88bec8666761cb92ce3c018e0e56a57057472dbb405a979' 
  AND token = 'n21N/qpZpt3qQKb2lGCsT9xmbMcQGmMB0WAAyZhI5Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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