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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd3b7f5181028bac0ba182ba69a6a357927f683d591aaeb59ed2b63e7d69111' 
  AND token = 'qXmnda5XMHcHaMGjRwMJccsi/HVseTlI+X37L+m+b20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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