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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3363e2e9702fc984898c5527c014de279eb6f4a7134bf989cab6c7be09ff112a' 
  AND token = 'JCHXquhpGX86vrSsanOq1ndQc64okiBBRi1BsBeDxa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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