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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab784cbeed6162745fa2e72fff7286792590bb5f8f8192704b44d993b420de0' 
  AND token = 'oMEb6cQoY1yjpPF4vUJuXipHY96/Ubbepuw++B1leRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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