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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf5c4256d25fbe0eb5430577ba4a2761ec192d6cad0e38a8fb78cfaca83e94a' 
  AND token = 'sXWZ9MtSqxwj5OVmL/f+N/9fcah7QfnGp0r8McPIjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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